Update {virtual,override} to follow C++11 style in remoting.

remoting/host/audio_capturer_win.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_HOST_AUDIO_CAPTURER_WIN_H_
 #define REMOTING_HOST_AUDIO_CAPTURER_WIN_H_
 
 #include <audioclient.h>
 #include <mmdeviceapi.h>
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "base/timer/timer.h"
 #include "base/win/scoped_co_mem.h"
 #include "base/win/scoped_comptr.h"
 #include "remoting/host/audio_capturer.h"
 #include "remoting/host/audio_silence_detector.h"
 #include "remoting/proto/audio.pb.h"
 
 namespace remoting {
 
 class AudioCapturerWin : public AudioCapturer {
  public:
   AudioCapturerWin();
-  virtual ~AudioCapturerWin();
+  ~AudioCapturerWin() override;
 
   // AudioCapturer interface.
-  virtual bool Start(const PacketCapturedCallback& callback) override;
+  bool Start(const PacketCapturedCallback& callback) override;
 
  private:
   // Receives all packets from the audio capture endpoint buffer and pushes them
   // to the network.
   void DoCapture();
 
   PacketCapturedCallback callback_;
 
   AudioPacket::SamplingRate sampling_rate_;
 
@@ skipping 10 matching lines @@
   HRESULT last_capture_error_;
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioCapturerWin);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_AUDIO_CAPTURER_WIN_H_